/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "../SDL_blit.h"
#include "SDL_fb3dfx.h"
#include "3dfx_mmio.h"


/* Wait for vertical retrace */
static void
WaitVBL(_THIS)
{
    /* find start of retrace */
    tdfx_waitidle();
    while ((tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == STATUS_RETRACE);
    /* wait until we're past the start */
    while ((tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == 0);
}

static void
WaitIdle(_THIS)
{
    tdfx_waitidle();
}

/* Sets video mem colorkey and accelerated blit function */
static int
SetHWColorKey(_THIS, SDL_Surface * surface, Uint32 key)
{
    return (0);
}

static int
FillHWRect(_THIS, SDL_Surface * dst, SDL_Rect * rect, Uint32 color)
{
    int bpp;
    char *dst_base;
    Uint32 format;
    int dstX, dstY;

    /* Don't blit to the display surface when switched away */
    if (switched_away) {
        return -2;              /* no hardware access */
    }
    if (dst == this->screen) {
        SDL_mutexP(hw_lock);
    }

    /* Set the destination pixel format */
    dst_base = (char *) ((char *) dst->pixels - mapped_mem);
    bpp = dst->format->BitsPerPixel;
    format = dst->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);

    /* Calculate source and destination base coordinates */
    dstX = rect->x;
    dstY = rect->y;

    /* Execute the fill command */
    tdfx_wait(6);
    tdfx_out32(DSTBASE, (Uint32) dst_base);
    tdfx_out32(DSTFORMAT, format);
    tdfx_out32(COLORFORE, color);
    tdfx_out32(COMMAND_2D, COMMAND_2D_FILLRECT);
    tdfx_out32(DSTSIZE, rect->w | (rect->h << 16));
    tdfx_out32(LAUNCH_2D, dstX | (dstY << 16));

    FB_AddBusySurface(dst);

    if (dst == this->screen) {
        SDL_mutexV(hw_lock);
    }
    return (0);
}

static int
HWAccelBlit(SDL_Surface * src, SDL_Rect * srcrect,
            SDL_Surface * dst, SDL_Rect * dstrect)
{
    SDL_VideoDevice *this = current_video;
    int bpp;
    Uint32 src_format;
    Uint32 dst_format;
    char *src_base;
    char *dst_base;
    int srcX, srcY;
    int dstX, dstY;
    Uint32 blitop;
    Uint32 use_colorkey;

    /* Don't blit to the display surface when switched away */
    if (switched_away) {
        return -2;              /* no hardware access */
    }
    if (dst == this->screen) {
        SDL_mutexP(hw_lock);
    }

    /* Set the source and destination pixel format */
    src_base = (char *) ((char *) src->pixels - mapped_mem);
    bpp = src->format->BitsPerPixel;
    src_format = src->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);
    dst_base = (char *) ((char *) dst->pixels - mapped_mem);
    bpp = dst->format->BitsPerPixel;
    dst_format = dst->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);

    srcX = srcrect->x;
    srcY = srcrect->y;
    dstX = dstrect->x;
    dstY = dstrect->y;

    /* Assemble the blit operation */
    blitop = COMMAND_2D_BITBLT | (0xCC << 24);
    if (srcX <= dstX) {
        blitop |= BIT(14);
        srcX += (dstrect->w - 1);
        dstX += (dstrect->w - 1);
    }
    if (srcY <= dstY) {
        blitop |= BIT(15);
        srcY += (dstrect->h - 1);
        dstY += (dstrect->h - 1);
    }

    /* Perform the blit! */
    if ((src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
        tdfx_wait(3);
        tdfx_out32(SRCCOLORKEYMIN, src->format->colorkey);
        tdfx_out32(SRCCOLORKEYMAX, src->format->colorkey);
        tdfx_out32(ROP_2D, 0xAA00);
        use_colorkey = 1;
    } else {
        use_colorkey = 0;
    }
    tdfx_wait(9);
    tdfx_out32(SRCBASE, (Uint32) src_base);
    tdfx_out32(SRCFORMAT, src_format);
    tdfx_out32(DSTBASE, (Uint32) dst_base);
    tdfx_out32(DSTFORMAT, src_format);
    tdfx_out32(COMMAND_2D, blitop);
    tdfx_out32(COMMANDEXTRA_2D, use_colorkey);
    tdfx_out32(DSTSIZE, dstrect->w | (dstrect->h << 16));
    tdfx_out32(DSTXY, dstX | (dstY << 16));
    tdfx_out32(LAUNCH_2D, srcX | (srcY << 16));

    FB_AddBusySurface(src);
    FB_AddBusySurface(dst);

    if (dst == this->screen) {
        SDL_mutexV(hw_lock);
    }
    return (0);
}

static int
CheckHWBlit(_THIS, SDL_Surface * src, SDL_Surface * dst)
{
    int accelerated;

    /* Set initial acceleration on */
    src->flags |= SDL_HWACCEL;

    /* Set the surface attributes */
    if ((src->flags & SDL_SRCALPHA) == SDL_SRCALPHA) {
        if (!this->info.blit_hw_A) {
            src->flags &= ~SDL_HWACCEL;
        }
    }
    if ((src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
        if (!this->info.blit_hw_CC) {
            src->flags &= ~SDL_HWACCEL;
        }
    }

    /* Check to see if final surface blit is accelerated */
    accelerated = !!(src->flags & SDL_HWACCEL);
    if (accelerated) {
        src->map->hw_blit = HWAccelBlit;
    }
    return (accelerated);
}

void
FB_3DfxAccel(_THIS, __u32 card)
{
    /* We have hardware accelerated surface functions */
    this->CheckHWBlit = CheckHWBlit;
    wait_vbl = WaitVBL;
    wait_idle = WaitIdle;

    /* Reset the 3Dfx controller */
    tdfx_out32(BRESERROR0, 0);
    tdfx_out32(BRESERROR1, 0);

    /* The 3Dfx has an accelerated color fill */
    this->info.blit_fill = 1;
    this->FillHWRect = FillHWRect;

    /* The 3Dfx has accelerated normal and colorkey blits */
    this->info.blit_hw = 1;
    this->info.blit_hw_CC = 1;
    this->SetHWColorKey = SetHWColorKey;
}

/* vi: set ts=4 sw=4 expandtab: */
